Ultrasound-Assisted Enzymatic Extraction of Adenosine from Vietnamese Cordyceps militaris and Bioactivity Analysis of the Extract oleh Thanh Vuong Hoai, Phuc Nguyen Cao, My Phan Le Thao, Tran Dat Do, Nam Hoang Minh, Huynh Ky Phuong Ha, Phong Mai Thanh, Hieu Nguyen Huu